How to calculate density? Given: Mass: 20.0 grams Volume is 31.0 ML I got 620g/mL. I want to know if this was right.

Expert Answers
electreto05 eNotes educator| Certified Educator

The density of a body is defined as the ratio of the mass m, and the volume V occupied by the body.

ρ = m/V

ρ   →   Density

m   →   mass of the body.

V   →   Volume of the body.

In this case we have a density:

ρ = 20.0 g/31.0 ml = 0.645 g/ml

It means you should check your calculations. Maybe the equation used is not correct.

gsenviro eNotes educator| Certified Educator

density is a ratio of mass to volume,

so density = mass/volume = 20/31 gm/ml = 0.645 gm/ml


Given mass=20.0 g)

Given volume=31.0ml

Therefore,density=20.0/31.0 g/ml


                        =0.645(approx round off)